Thank for your interest Miguel. I have no experience with CPython codebase so I'll be glad if you work on this.
I think treating ZipFile's like a separate drive would be the best. If we agree on this then probably all of the properties and methods from pathlib could be implemented. But without this at least `suffix`, `suffixes`, `stem`, `with_name()`, `with_stem()`, and `with_suffix()` makes perfect sense.
If some of the properties/methods won't be implemented on zipfile.Path then it would be useful to raise `NotImplementedError`. Currently, trying to use suffix property, raises the error `AttributeError: 'Path' object has no attribute 'suffix'`. This is confusing as the name of the class is the same as in `pathlib.Path` so it's not immediately obvious that it meant `zipfile.Path`.
The use-case for mimicking those two interfaces closely is to use both interchangeably (thanks to duck-typing).